The 2003 V8 Supercar season was the 44th year of touring car racing in Australia since the first runnings of the Australian Touring Car Championship and the fore-runner of the present day Bathurst 1000, the Armstrong 500.
The 2003 season brought substantial change at the pointy end of the series, with the era of the Holden Racing Teams dominance of V8 Supercar ending and the era of Stone Brothers Racing beginning.
Holden did not give in willingly, Mark Skaife and Greg Murphy each winning two rounds, with Skaife and Todd Kelly taking the reborn Sandown 500 as one of them, while one of Murphy's wins was Bathurst with his co-driver Rick Kelly becoming the youngest Bathurst winner.
The only other round winner was Craig Lowndes had his first win for new team Ford Performance Racing.
Apart from the enduros, Stone Brothers Racing swept all before them with Mark Winterbottom dominating the Konica V8 Supercar Series in SBR's older AU Falcon.